static void chunkqueue_append_chunk(chunkqueue *cq, chunk *c) {
c->next = NULL;
if (cq->last) {
cq->last->next = c;
}
cq->last = c;
if (NULL == cq->first) {
cq->first = c;
}
cq->bytes_in += chunk_remaining_length(c);
}
void chunkqueue_steal(chunkqueue *dest, chunkqueue *src, off_t len) {
while (len > 0) {
chunk *c = src->first;
off_t clen = 0, use;
if (NULL == c) break;
clen = chunk_remaining_length(c);
if (0 == clen) {
/* drop empty chunk */
src->first = c->next;
if (c == src->last) src->last = NULL;
chunkqueue_push_unused_chunk(src, c);
continue;
}
use = len >= clen ? clen : len;
len -= use;
if (use == clen) {
/* move complete chunk */
src->first = c->next;
if (c == src->last) src->last = NULL;
chunkqueue_append_chunk(dest, c);
} else {
/* partial chunk with length "use" */
switch (c->type) {
case MEM_CHUNK:
chunkqueue_append_mem(dest, c->mem->ptr + c->offset, use);
break;
case FILE_CHUNK:
/* tempfile flag is in "last" chunk after the split */
chunkqueue_append_file(dest, c->file.name, c->file.start + c->offset, use);
break;
}
c->offset += use;
force_assert(0 == len);
}
src->bytes_out += use;
}
}